Island



model.

B. GARDNER.

Propeller.

No. 234,267. Patented Nov. 9, T880.

INVENTOR:

ATTORNEYS.

UNITED STATES PATENT OFFICE.

RIO GARDNER, OF WESTERLY, RHODE ISLAND.

PROPELLER.

SPECIFICATION forming part of Letters Patent No. 234,267, dated November 9, 1880.

Application filed September 7, 1880.

. and-tenon joints and suitable bolts and screws.

Figure lvis a plan of the propeller-hub with one blade attached thereto. Fig. 2 is a side elevation of the same; Fig. 3, a section of the joint.

Similar letters of reference indicate corresponding parts. i

In the drawings, A represents the propellerhub, and B B the short arms thereof, provided with mortised and tenoned or rabbeted eX- tremities a a and fows of bolt-holes b b.

O O are the propeller-blades, provided with oblique mortise and tenon or rabbets on the arms B B, and with bolt-holes cl cl, corresponding to those on the short arms B B.

The blades 0 G are secured firmly to the arms B B by engaging the opposite mortises and tenons or rabbets a a and 0 0 with each other, and then driving the bolts f f through the corresponding bolt-holes b I) d d, as shown in Fig.3, and securing said bolts ff by nuts g g. With this construction a broken blade, 0, may readily be removed by unscrewing nuts 9 and taking out the bolts ff, and another he put in its place and immovably secured by reinserting bolts f f, or substituting new ones therefor and screwing nuts 9 g thereon. Hence it will be seen that this propeller possesses a great advantage over those in which the hub and blades are cast together, as in such pro- (ModeL) pellers a broken blade cannot, or only with great difficulty, be repaired.

The blades (3, being tenoned and rabbeted or mortised and bolted to the mortised and tenoned arms B, as shown, make a propeller of great strength, easy to repair, and compact and convenient to transport, as the blades can be carried separate from the hub and arms, and a few extra blades for use in case of accident can easily and conveniently be stored away in a vessel, whereas the ordinary propeller is difficult to handle and transport and store, because of its weight and dimensions, and in case ot'damage to an ordinary propeller it must usually be replaced by a new one.

By casting the blades separately from the hub and arms, too, it is easier to obtain a pro peller more free from blow-holes, and therefore of greater strength, than by casting a propeller in one piece.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a propeller, the oblique mortises and tenons a 0, formed respectively on the extremities of the short arms of the hub A and the blades 0, in combination with the transverse boltsf, substantially as herein shown and described.

2. A propeller constructed substantially as herein shown and described, consisting of the hub A, provided with short arms B B, having mortised and tenoned or rabbeted extremities a a and bolt-holes b 1), blades C- 0, having corresponding mortises and tenons o c and boltholes d d, and boltsff, as set forth.

RIO GARDNER.

Vitnesses:

CHARLES PERRIN, W. H. ROBINSON. 

